New Castle, PA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for New Castle, PA.

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Current Conditions — New Castle, PA

NEW CASTLE MUNI (KUCP)

Clear

66.2 F
Humidity:35%
Wind Speed:S 3.4 mph
Barometer:29.98 in
Dewpoint:37.4 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 21 2026, 07:20 PM EDT
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5-Day Forecast — New Castle, PA

Tuesday

High 66 °F
Mostly Cloudy
Tuesday
Night
Low 53 °F
T-storms Likely
Wednesday

High 73 °F
Slight Chance of Showers
Wednesday
Night
Low 48 °F
Partly Cloudy
Thursday

High 78 °F
Partly Sunny
Thursday
Night
Low 53 °F
Partly Cloudy
Friday

High 80 °F
Chance of T-storms
Friday
Night
Low 55 °F
T-storms Likely
Saturday

High 68 °F
T-storms Likely

Detailed Forecast — New Castle, PA

Tuesday
Mostly Cloudy. High near 66°F. Wind 6 to 8 mph, with gusts as high as 16 mph.
Tuesday Night
Thunderstorms Likely. Low around 53°F. Wind around 6 mph, with gusts as high as 15 mph.
Wednesday
Slight Chance of Showers. High near 73°F. Wind 5 to 8 mph, with gusts as high as 15 mph.
Wednesday Night
Partly Cloudy. Low around 48°F. Wind 1 to 3 mph, with gusts as high as 10 mph.
Thursday
Partly Sunny. High near 78°F. Wind 1 to 3 mph, with gusts as high as 9 mph.
Thursday Night
Partly Cloudy. Low around 53°F. Wind around 2 mph, with gusts as high as 6 mph.
Friday
Chance of Thunderstorms. High near 80°F. Wind 2 to 7 mph, with gusts as high as 14 mph.
Friday Night
Thunderstorms Likely. Low around 55°F. Wind around 3 mph, with gusts as high as 10 mph.
Saturday
Thunderstorms Likely. High near 68°F. Wind 5 to 8 mph, with gusts as high as 16 mph.
Saturday Night
Chance of Rain. Low around 48°F. Wind around 6 mph, with gusts as high as 13 mph.
Sunday
Chance of Rain Showers. High near 68°F. Wind 6 to 8 mph, with gusts as high as 15 mph.
Sunday Night
Partly Cloudy. Low around 46°F. Wind around 6 mph, with gusts as high as 13 mph.
Monday
Chance of Thunderstorms. High near 73°F. Wind 6 to 9 mph, with gusts as high as 17 mph.
PA Radar
Current Radar • PA
Day 1 Outlook • April 21, 2026

Observation History — New Castle, PA

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
07:20 PM EDT S 3.4 10.00 Clear -- 66.2 37.4 35% NA NA 29.98 1015.2
07:10 PM EDT 4.6 10.00 Clear -- 66.2 37.4 35% NA NA 29.99 1015.6
07:05 PM EDT S 3.4 10.00 Clear -- 66.2 37.4 35% NA NA 29.99 1015.6
07:00 PM EDT SW 4.6 10.00 Clear -- 66.2 37.4 35% NA NA 29.99 1015.6
06:45 PM EDT SW 8.1 10.00 Clear -- 68.0 37.4 32% NA NA 29.99 1015.6
06:35 PM EDT SW 8.1 10.00 Clear -- 69.8 37.4 31% NA NA 29.99 1015.6
06:30 PM EDT 4.6 10.00 Clear -- 69.8 37.4 31% NA NA 29.99 1015.6
06:25 PM EDT SW 6.9 10.00 Clear -- 69.8 37.4 31% NA NA 29.99 1015.6
06:20 PM EDT SW 6.9 10.00 Clear -- 69.8 37.4 31% NA NA 30.00 1015.9
06:15 PM EDT SW 6.9 10.00 Clear -- 68.0 37.4 32% NA NA 30.00 1015.9
06:05 PM EDT 5.7 10.00 Clear -- 69.8 37.4 31% NA NA 30.00 1015.9
06:00 PM EDT 8.1 10.00 Clear -- 69.8 35.6 28% NA NA 30.00 1015.9
05:50 PM EDT SW 6.9 10.00 Clear -- 68.0 35.6 30% NA NA 30.00 1015.9
05:45 PM EDT SW 12.7 G 18.4 10.00 Clear -- 68.0 35.6 30% NA NA 30.00 1015.9
05:40 PM EDT 9.2 10.00 Clear -- 66.2 35.6 32% NA NA 30.00 1015.9
05:35 PM EDT 8.1 10.00 Clear -- 66.2 37.4 35% NA NA 30.00 1015.9
05:30 PM EDT 5.7 10.00 Clear -- 66.2 35.6 32% NA NA 30.00 1015.9
05:20 PM EDT S 4.6 10.00 Clear -- 66.2 35.6 32% NA NA 30.00 1015.9
05:10 PM EDT 8.1 10.00 Clear -- 66.2 35.6 32% NA NA 30.01 1016.3
05:05 PM EDT SW 8.1 10.00 Clear -- 66.2 35.6 32% NA NA 30.01 1016.3
05:00 PM EDT 8.1 10.00 Clear -- 66.2 35.6 32% NA NA 30.02 1016.6
04:50 PM EDT SW 6.9 10.00 Mostly Clear -- 66.2 35.6 32% NA NA 30.01 1016.3
04:45 PM EDT 6.9 10.00 Mostly Clear -- 66.2 33.8 30% NA NA 30.02 1016.6
04:40 PM EDT S 6.9 10.00 Mostly Clear -- 66.2 33.8 30% NA NA 30.01 1016.3

Regional Weather Observation

NEW CASTLE MUNI (KUCP)

Clear
66.2 F

YOUNGSTOWN (KYNG)

NULL
64.4 F

MEADVILLE (KGKJ)

NULL
62.6 F

ASHTABULA (KHZY)

Clear
62.6 F

BEAVER FALLS ARP (KBVI)

Clear
68.4 F

RAVENA/PORTAGE (KPOV)

Clear
67.1 F
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